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Despite the name, the electric eel is a type of knifefish. The Gymnotiformes / dʒ ɪ m ˈ n ɒ t ɪ f ɔːr m iː z / are an order of teleost bony fishes commonly known as Neotropical knifefish or South American knifefish. They have long bodies and swim using undulations of their elongated anal fin.
The African knifefish, Gymnarchus niloticus – also called the aba aba [a] – is an electric fish, living at the bottoms of rivers and lakes. It is the only species in the genus Gymnarchus and the family Gymnarchidae , within the order Osteoglossiformes .
Knifefish may refer to several knife-shaped fishes: The Neotropical or weakly electric knifefishes, order Gymnotiformes , containing five families: Family Gymnotidae (banded knifefishes and the electric eel )
Mecistocephalus japonicus is a species of soil centipede in the family Mecistocephalidae. [1] [2] This centipede is notable for featuring 63 or 65 pairs of legs rather than the 49 leg pairs usually observed in the genus Mecistocephalus.
Sand knifefish are freshwater electric fish of the family Rhamphichthyidae, from freshwater habitats in South America. [1] Just like most part of the members of the Gymnotiformes group, they also have elongated and compressed bodies and electric organs. The long anal fin actually extends from before the pectoral fins to the tip of the tail.
The 10 species in four genera are: [3] Subfamily Xenomystinae Greenwood 1963 (African knifefishes, African featherbacks). Genus Papyrocranus Greenwood, 1963. Papyrocranus afer (Günther, 1868) (reticulated knifefish)
The clown featherback (Chitala ornata), also known as the clown knifefish and spotted knifefish, is a nocturnal species of tropical fish with a long, knife-like body. This knifefish is native to freshwater habitats in Cambodia, China, Hong Kong, Laos, Macau, Thailand, and Vietnam, [2] but it has also been introduced to regions outside its native range. [1]
Scolopendra morsitans was first described by Carl Linnaeus in his book 10th edition of Systema Naturae in 1758 and has since retained its original scientific name. [15] The species was nominated as the type species of the centipede genus Scolopendra in a submission to the International Commission on Zoological Nomenclature in 1955 which was approved two years later.